package com.imooc.o2o.web.shopadmin;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.imooc.o2o.dto.ImageHolder;
import com.imooc.o2o.dto.ProductExecution;
import com.imooc.o2o.entity.Product;
import com.imooc.o2o.entity.ProductCategory;
import com.imooc.o2o.entity.Shop;
import com.imooc.o2o.enums.ProductStateEnum;
import com.imooc.o2o.exception.ProductOperationException;
import com.imooc.o2o.service.ProductCategoryService;
import com.imooc.o2o.service.ProductService;
import com.imooc.o2o.util.CodeUtil;
import com.imooc.o2o.util.HttpServiceRequestUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 商品
 * Created by Knight on 2018/7/6.
 */
@Controller
@RequestMapping("/shopadmin")
public class ProductManagementController {
    @Autowired
    private ProductService productService;
    @Autowired
    private ProductCategoryService productCategoryService;

    //支持上传商品详情图的最大数量
    private static final int IMAGEMAXCOUNT=6;

    /**
     *通过店铺id获取该店铺下的商品列表
     * @param request
     * @return
     */
    @RequestMapping(value = "/getproductlistbyshop", method = RequestMethod.GET)
    @ResponseBody
    private Map<String, Object> getProductCategoryListByShopId(HttpServletRequest request) {
        Map<String, Object> modelMap = new HashMap<String, Object>();
        //获取前台传过来的页码
        int pageIndex=HttpServiceRequestUtil.getInt(request,"pageIndex");
        //获取前台传过来的每页要求返回的商品数上限
        int pageSize=HttpServiceRequestUtil.getInt(request,"pageSize");
        //从当前session中获取店铺信息,主要是获取shopId
        Shop currentShop=(Shop) request.getSession().getAttribute("currentShop");
        //空值判断
        if ((pageIndex>-1)&&(pageSize>-1)&&(currentShop != null) && (currentShop.getShopId() != null)) {
            //获取传入的需要检索的条件,包括是否需要从某个商品类别以及模糊查找商品名去筛选某个店铺下的商品列表
            //筛选的条件可以进行排列组合
            long productCategoryId=HttpServiceRequestUtil.getLong(request,"productCategoryId");
            String productName=HttpServiceRequestUtil.getString(request,"productName");
            Product productCondition=compactProductCondition(currentShop.getShopId(),productCategoryId,productName);
            //传入查询条件已经分页信息进行查询,返回相应商品列表以及总数
            ProductExecution pe= productService.getProductList(productCondition,pageIndex,pageSize);
            modelMap.put("productList", pe.getProductList());
            modelMap.put("count", pe.getCount());
            modelMap.put("success", true);
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "empty pageSize or pageIndex or shopId");
        }
        return modelMap;
    }

    /**
     * 添加商品
     * @param request
     * @return
     */
    @RequestMapping(value = "/addproduct",method = RequestMethod.POST)
    @ResponseBody
    private Map<String,Object> addProduct(HttpServletRequest request){
        Map<String,Object> modelMap=new HashMap<>();
        //验证码校验
        if(!CodeUtil.checkVerifyCode(request)){
            modelMap.put("success",false);
            modelMap.put("errMsg","输入了错误的验证码");
            return modelMap;
        }
        //接收前端参数的变量的初始化,包括商品,缩略图,详情图列表实体类
        ObjectMapper mapper=new ObjectMapper();
        Product product=null;
        String productStr= HttpServiceRequestUtil.getString(request,"productStr");
        MultipartHttpServletRequest multipartRequest=null;
        ImageHolder thumbnail=null;
        List<ImageHolder> productImgList=new ArrayList<>();
        CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(request.getSession().getServletContext());
        try {
            //若请求中存在文件流,则取出相关的文件(包括缩略图和详情图)
            if(multipartResolver.isMultipart(request)){
                thumbnail = handleImage((MultipartHttpServletRequest) request,thumbnail, productImgList);
            }else {
                modelMap.put("success",false);
                modelMap.put("errMsg","上传图片不能为空");
                return modelMap;
            }
        }catch (Exception e){
            modelMap.put("success",false);
            modelMap.put("errMsg",e.toString());
            return modelMap;
        }
        try {
            //尝试获取前端传过来的表单string流并将其转换成Product实体类
            product=mapper.readValue(productStr,Product.class);
        }catch (Exception e){
            modelMap.put("success",false);
            modelMap.put("errMsg",e.toString());
            return modelMap;
        }
        //若Product信息,缩略图以及详情图列表为非空,则开始进行商品添加操作
        if(product!=null && thumbnail!=null && productImgList.size()>0){
            try{
               //从session中获取当前店铺的Id并赋值给product,减少对前端数据的依赖
                Shop currentShop=(Shop) request.getSession().getAttribute("currentShop");
                product.setShop(currentShop);
                //执行添加操作
                ProductExecution pe=productService.addProduct(product,thumbnail,productImgList);
                if(pe.getState()== ProductStateEnum.SUCCESS.getState()){
                    modelMap.put("success",true);
                }else{
                    modelMap.put("success",false);
                    modelMap.put("errMsg",pe.getStateInfo());
                }
            }catch (ProductOperationException e){
                modelMap.put("success",false);
                modelMap.put("errMsg",e.toString());
                return modelMap;
            }
        }else{
            modelMap.put("success",false);
            modelMap.put("errMsg","请输入商品信息");
        }
        return modelMap;

    }



    /**
     *  获取单个商品
     * @param productId
     * @return
     */
    @RequestMapping(value = "/getproductbyid",method = RequestMethod.GET)
    @ResponseBody
    private Map<String,Object> getProductById(@RequestParam Long productId){
        Map<String, Object> modelMap = new HashMap<String, Object>();
        if (productId > -1) {
            Product product = productService.getProductById(productId);
            List<ProductCategory> productCategoryList = productCategoryService
                    .getProductCategoryList(product.getShop().getShopId());
            modelMap.put("product", product);
            modelMap.put("productCategoryList", productCategoryList);
            modelMap.put("success", true);
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "empty pageSize or pageIndex or shopId");
        }
        return modelMap;
    }

    /**
     * 商品编辑
     * @param request
     * @return
     */
    @RequestMapping(value = "/modifyproduct",method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> modifyProduct(HttpServletRequest request) {
        //是商品编辑时候调用还是上下架操作的时候调用
        //若为前者则进行验证码判断,后者则跳过验证码判断
        boolean statusChange = HttpServiceRequestUtil.getBoolean(request,"statusChange");
        //验证码判断
        Map<String, Object> modelMap = new HashMap<String, Object>();
        if (!statusChange && !CodeUtil.checkVerifyCode(request)) {
            modelMap.put("success", false);
            modelMap.put("errMsg", "输入了错误的验证码");
            return modelMap;
        }
        //接收前端参数的变量的初始化,包括商品,缩略图,详情图列表实体类
        ObjectMapper mapper = new ObjectMapper();
        Product product = null;
        ImageHolder thumbnail=null;
        List<ImageHolder> productImgList = new ArrayList<ImageHolder>();
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        //若请求中存在文件流,则取出相关的文件(包括缩略图和详情图)
        try {
            if (multipartResolver.isMultipart(request)) {
                thumbnail = handleImage((MultipartHttpServletRequest) request, thumbnail, productImgList);
            }
        } catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        try{
            String productStr=HttpServiceRequestUtil.getString(request,"productStr");
            //尝试获取前端传过来的表单string流并将其转换成Product实体类
            product=mapper.readValue(productStr,Product.class);
        }catch (Exception e){
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        //非空判断
        if (product != null) {
            try {
                //从session中获取当前店铺的Id并赋值给priduct,减少对前端数据的依赖
                Shop currentShop = (Shop) request.getSession().getAttribute("currentShop");
                product.setShop(currentShop);
                //开始进行商品信息变更操作
                ProductExecution pe = productService.modifyProduct(product,
                        thumbnail, productImgList);
                if (pe.getState() == ProductStateEnum.SUCCESS.getState()) {
                    modelMap.put("success", true);
                } else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", pe.getStateInfo());
                }
            } catch (RuntimeException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
                return modelMap;
            }

        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "请输入商品信息");
        }
        return modelMap;
    }

    /**
     * 图片上传
     * @param request
     * @param thumbnail
     * @param productImgs
     * @return
     * @throws IOException
     */
    private ImageHolder handleImage(MultipartHttpServletRequest request, ImageHolder thumbnail, List<ImageHolder> productImgs) throws IOException {
        MultipartHttpServletRequest multipartRequest = request;
        //取出缩略图并构建ImageHolder对象
        CommonsMultipartFile thumbnailFile = (CommonsMultipartFile) multipartRequest.getFile("thumbnail");
        if(thumbnailFile!=null){
             thumbnail=new ImageHolder(thumbnailFile.getOriginalFilename(),thumbnailFile.getInputStream());
        }
        //取出详情图列表并构建List<ImageHolder>列表对象,最多支持六张图片上传
        for (int i = 0; i < IMAGEMAXCOUNT; i++) {
            CommonsMultipartFile productImgFile = (CommonsMultipartFile) multipartRequest
                    .getFile("productImg" + i);
            if (productImgFile != null) {
                //若取出的第i个详情图片文件流不为空,则将其加入详情图列表
                ImageHolder productImg=new ImageHolder(productImgFile.getOriginalFilename(),
                        productImgFile.getInputStream());
                productImgs.add(productImg);
            }else{
                //若取出的第i个详情图片文件流为空,则终止循环
                break;
            }
        }
        return thumbnail;
    }

    /**
     * 封装商品查询条件到Product实例中
     * @param shopId
     * @param productCategoryId
     * @param productName
     * @return
     */
    private Product compactProductCondition(long shopId,long productCategoryId, String productName) {
        Product productCondition = new Product();
        Shop shop = new Shop();
        shop.setShopId(shopId);
        productCondition.setShop(shop);
        //若有指定类别的要求则添加进去
        if (productCategoryId != -1L) {
            ProductCategory productCategory = new ProductCategory();
            productCategory.setProductCategoryId(productCategoryId);
            productCondition.setProductCategory(productCategory);
        }
        //若有商品名模糊查询的要求则添加进去
        if (productName != null) {
            productCondition.setProductName(productName);
        }
        return productCondition;
    }
}
